Ask questions which are clear, concise and easy to understand.

Why carboxylic acid does not undergo friedal craft reaction ?

Posted by chetan pandey (Mar 23, 2017 1:01 a.m.) (Question ID: 4427)

  • Answers:
  • Ans. Carboxylic acid does not undergo Friedel-Craft's reaction because the Carboxyl group is deactivating and the catalyst AlCl3(anhy.) gets bonded to Carboxyl group.

    Answered by Naveen Sharma (Mar 23, 2017 4:55 a.m.)
    Thanks (1)
  • Add Answer

What is D-D transition?

Posted by Bhavna Rawal (Mar 22, 2017 11:49 p.m.) (Question ID: 4425)

  • Answers:
  • Ans. In the transiton metal ions the electrons can be promoted from one energy level to other energy level in the same d-subshell.this phenomenon is called d-d-transition.By this property only transiton elements show colour.

    Answered by Naveen Sharma (Mar 23, 2017 5:03 a.m.)
    Thanks (0)
  • Add Answer

In complex Na3[Cr(OH)2F4] we write chromate and in [Cr(H2O)5Cl]Clwe write chromium.why?

Posted by Bhavna Rawal (Mar 22, 2017 8:52 p.m.) (Question ID: 4410)

  • Answers:
  • This is because when  metal is a part Of anion we do special ending by using the suffix ate 

    But when it is a part of cationic part then we write it's simple name. 

    Answered by payal Kathuria (Mar 22, 2017 8:58 p.m.)
    Thanks (1)
  • Add Answer

What are +I effect &  -I effect ? Plzz give their examples also .

Posted by Amarjeet kaur (Mar 22, 2017 8:13 p.m.) (Question ID: 4408)

What would happen if the protective tin coating over an iron bucket is broken from some places?

Posted by Bhavna Rawal (Mar 22, 2017 7:36 a.m.) (Question ID: 4376)

  • Answers:
  • Ans. Once the protective ‘Tin’ layer is broken, the Iron gets exposed to the atmosphere and that portion will corrode faster as the oxidation potential of Fe is higher than that of tin.

    Answered by Naveen Sharma (Mar 22, 2017 8:47 a.m.)
    Thanks (1)
  • Add Answer

Under what condition will a galvanic cell send no current into inner circuit?

Posted by Bhavna Rawal (Mar 22, 2017 7:35 a.m.) (Question ID: 4375)

  • Answers:
  • Ans. If salt bridge is not used, the current will not flow in the outer circuit after sometime in a galvanic cell.

    Answered by Naveen Sharma (Mar 22, 2017 8:48 a.m.)
    Thanks (1)
  • Add Answer

What is the basis of obtaining electrical energy in fuel cell?

Posted by Bhavna Rawal (Mar 22, 2017 7:34 a.m.) (Question ID: 4374)

  • Answers:
  • Ans. A fuel cell is a device that converts the chemical energy from a fuel into electricity through a chemical reaction with oxygen or another oxidizing agent.

    Answered by Naveen Sharma (Mar 22, 2017 8:49 a.m.)
    Thanks (1)
  • Add Answer

Explain:  Henry's law about dissolution of a gas.

Posted by Amarjeet kaur (Mar 21, 2017 11:41 p.m.) (Question ID: 4368)

  • Answers:
  • Ans. Henry's law states that at a constant temperature, the amount of a gas that dissolves in a liquid is directly proportional to the partial pressure of that gas in equilibrium with that liquid. It was formulated by William Henry in 1803.

    Answered by Naveen Sharma (Mar 22, 2017 8:53 a.m.)
    Thanks (1)
  • Add Answer

convert 2-iodopropane to 2,3-dimethylbutane

Posted by devika nair (Mar 21, 2017 8:21 p.m.) (Question ID: 4356)

Two liquids A & B boils at 145° & 190° resp. Which of them has a higher Vapour pressure at 80°C

Posted by Bhavna Rawal (Mar 21, 2017 8:01 p.m.) (Question ID: 4355)

  • Answers:
  • A will have more vapour pressure since its boiling point is less and hence is more volatile.

    Answered by Kiran Mishra (Mar 21, 2017 8:45 p.m.)
    Thanks (1)
  • Add Answer

WOLFF KOshner

 

Posted by Yaswant Wahengbam (Mar 21, 2017 4:39 p.m.) (Question ID: 4340)

  • It's wolf kishner

    Posted by Pratit Luthra (Mar 22, 2017 1:12 p.m.)
  • Add Comment
  • Answers:
  • Ans. The Wolff Kishner reduction reaction is a method in which a carbonyl compound (aldehyde or a ketone) is reduced to a hydrocarbon.

    In this method, the carbonyl compound is heated with a mixture of hydrazine and strong base such as potassium hydroxide or potassium tert-butoxide at a temperature of 453-473 K in ethylene glycol solvent.

    During this reduction reaction, the aldehyde or ketone is first treated with hydrazine to form the corresponding hydrazone. On reaction with a strong base, the hydrazone gets converted to a hydrocarbon.

    Answered by Naveen Sharma (Mar 21, 2017 6:15 p.m.)
    Thanks (0)
  • Add Answer

Is structure of drugs in chapter ( chemistry in everyday life ) is necessary for class 12 cbse examination if so please tell me important one

 

Posted by Shivani Pandey (Mar 21, 2017 6:36 a.m.) (Question ID: 4301)

  • Answers:
  • No it's not necessary

    Answered by Lokendra Soni (Mar 22, 2017 7:03 a.m.)
    Thanks (0)
  • Add Answer

Please tell me important questions for passing marks in class 12 chemistry.

Posted by Nikhil Tanwar (Mar 20, 2017 3:25 p.m.) (Question ID: 4201)

What is electron gain enthalpy and ionization enthalpy 

Posted by Dinesh Kumar (Mar 20, 2017 3:11 p.m.) (Question ID: 4199)

  • Answers:
  • Ans. Electron Gain Enthalpy is the energy released when one mole of electron are added to gaseous atoms of an element.

    Ionization energy is the minimum amount of energy required to remove an electron from valence shell of a gaseous isolated atom.

    Answered by Naveen Sharma (Mar 21, 2017 10:58 a.m.)
    Thanks (0)
  • Add Answer

Write the chemistry of blue vitriol?

 

Posted by Shiva Lamsal (Mar 19, 2017 9:51 p.m.) (Question ID: 4156)

explain stability of co ordination compound

Posted by tanya Prasad (Mar 19, 2017 3:46 p.m.) (Question ID: 4132)

how to nomenclate [Ag(NH3)2][Ag(CN)2]

Posted by tanya Prasad (Mar 19, 2017 3:39 p.m.) (Question ID: 4130)

Why anisole does not react with friedel craft?

Posted by Varun Singh (Mar 18, 2017 8:33 a.m.) (Question ID: 4044)

  • Sry aniline

    Posted by Varun Singh (Mar 18, 2017 8:37 a.m.)
  • Add Comment
  • Answers:
  • Ans. Aniline does not undergo Friedel craft's reactions because the reagent AlCl3 (the Lewis acid which is used as a catalyst in friedel crafts reaction), being electron deficient acts as a Lewis base. and attacks on the lone pair of nitrogen present in aniline to form an insoluble complex which precipitates out and the reaction does not proceed.

    Answered by Naveen Sharma (Mar 18, 2017 9:43 a.m.)
    Thanks (0)
  • Add Answer

Under what conditions could Quartz be converted into glass????

Posted by Priyankaa Singh (Mar 17, 2017 9:22 p.m.) (Question ID: 4031)

  • What is quartz?

    Posted by JD Shukla (Mar 18, 2017 1:31 p.m.)
  • Add Comment
  • Answers:
  • Ans. Quartz can be converted into glass by heating and then cooling it rapidly.

    Answered by Naveen Sharma (Mar 17, 2017 9:59 p.m.)
    Thanks (2)
  • Add Answer

Examples of Biodegradable and Non Biodegradable detergents???

Posted by Priyankaa Singh (Mar 17, 2017 12:28 p.m.) (Question ID: 3981)

  • Answers:
  • Ans.

    • Detergents that can be degraded by bacteria are called biodegradable detergents. Such detergents have straight hydrocarbon chains. For example: Sodium Lauryl Sulphate
    • Detergents that cannot be degraded by bacteria are called non-biodegradable detergents. Such detergents have highly-branched hydrocarbon chains. For example: Sodium -4- (1, 3, 5, 7- Tetra Methyl Octyl) Benzene Sulphonate.
    Answered by Naveen Sharma (Mar 17, 2017 12:51 p.m.)
    Thanks (1)
  • Add Answer

Name the reactions from organic chemistry whose mechanism is in syllabus for board exam 

Posted by Dinesh Kumar (Mar 17, 2017 11:38 a.m.) (Question ID: 3975)

Naveen Sharma Sir please tell if derivations like nernst equation  come in board exam!! 

Posted by Dinesh Kumar (Mar 17, 2017 11:27 a.m.) (Question ID: 3973)

  • Derivations from drug chapter don't come but you still need to know the basic idea behind how it has been derived. Surely it ll help you in some competative exams.

     

    Posted by Naveen Sharma (Mar 17, 2017 12:59 p.m.)
  • Any derivations from chemical kinetics 

    Posted by Dinesh Kumar (Mar 17, 2017 11:52 a.m.)
  • Add Comment
  • Answers:
  • Dinesh Kumar, I have already asked Naveen sir about this...No derivations don't come...

    Answered by Priyankaa Singh (Mar 17, 2017 12:20 p.m.)
    Thanks (0)
  • Add Answer

Sir Naveen Sharma, kindly pay attention to the preceding query.....

Are the derivations of formulas from physical chemistry and structure of drugs from chapter 16 are asked in boards????

Posted by Priyankaa Singh (Mar 16, 2017 9:15 p.m.) (Question ID: 3950)

  • Answers:
  • Ans. No derivations and structure are not asked in boards. 

    Answered by Naveen Sharma (Mar 16, 2017 10:53 p.m.)
    Thanks (2)
  • Add Answer

Are the derivations of formulas and structure of drugs from chapter 16 are asked in boards????

Posted by Priyankaa Singh (Mar 16, 2017 11:05 a.m.) (Question ID: 3905)

  • Answers:
  • Sir Naveen Sharma, kindly clarify the query.....Are the derivations of formulas and structure of drugs asked????

    Answered by Priyankaa Singh (Mar 16, 2017 7:36 p.m.)
    Thanks (0)
  • Ma'am cam we know which type of question come in exam

    Answered by Pratit Luthra (Mar 16, 2017 6:53 p.m.)
    Thanks (1)
  • No this type of question are not asked by board papers

    Answered by Sona Belwal (Mar 16, 2017 11:19 a.m.)
    Thanks (1)
  • Add Answer

Detailed note on synthetic detergent

Posted by Manish Singh (Mar 10, 2017 6:57 p.m.) (Question ID: 3459)

Nowadays i am feeling many difficulties in chemistry whatever i had studied i didn't remember anything and as result i am running from chemistry i don't want to read it again please help me give me some suggestions for my improvement in this subject. 

Posted by Shradha Mehra (Mar 05, 2017 10:59 p.m.) (Question ID: 3147)

Can one add a carbon atom to an alcohol by using bayers reagent

Posted by divya bhaskaran (Mar 04, 2017 6:02 p.m.) (Question ID: 3054)

What is polarising power?

Posted by Vani Goyal (Mar 04, 2017 11:38 a.m.) (Question ID: 3027)

  • Answers:
  • The ability of cation to distort the electron cloud of anion is called polarising power

     

    Answered by Pratit Luthra (Mar 04, 2017 5:29 p.m.)
    Thanks (0)
  • Add Answer

what are oli sacchirides

Posted by humzah qadri (Mar 03, 2017 8:44 p.m.) (Question ID: 3002)

  • Answers:
  • THAT IS OLIGO SACCHARIDES.

    Oligo saccharides are the carbohydrates on hydrolysis give two to ten units of monosaccharides

     

    Answered by Pratit Luthra (Mar 04, 2017 5:35 p.m.)
    Thanks (0)
  • Add Answer

what is the structure of DDE? 

Posted by sujeet kushwaha (Mar 02, 2017 6:20 p.m.) (Question ID: 2918)

  • Image

     

    Posted by Naveen Sharma (Mar 02, 2017 6:39 p.m.)
  • Add Comment
  • Answers:
  • Ans. Dichlorodiphenyldichloroethylene (DDE) is a chemical compound formed by the loss of hydrogen chloride from DDT, of which it is one of the more common breakdown products.

    Answered by Naveen Sharma (Mar 02, 2017 6:34 p.m.)
    Thanks (1)
  • Add Answer

Sponsored Links

Download Mobile App

banner

Subscribe by E-mail

For Latest News and Updates from myCBSEguide.com
Enter your email address:

Connect via Facebook

Sponsored Links